A photo of your current set up may be useful. I'm having a little trouble visualizing...I have a broody sitting on eggs and the first one began to pip this afternoon. The broody is in a nest box (enclosed cat litter box) in a corner of the pullets' coop. Unfortunately my breeding pens/extra grow-out pens are not complete and won't be for a week or so. The other pullets have continued laying in that box with the broody the whole time, even though they have other nest boxes available. One day I found three birds in the box at the same time. Yikes...
I put a 2" x 4" wire cage around the nest box with the broody to keep the pullets out of the nest box while the chicks hatch. It's kind of small but there is enough room for the broody to get out and move around a little. Not as much as she would like. I put a bowl of feed in there for her and some water. I was figuring after the chicks hatch I could keep chick feed and water in the cage and the chicks could run in and out but the big girls can't get to it. I am hoping broody girl is a good chick momma and takes care of the babies after hatching. We will see.
My question is, what kind of roosting area should I set up for broody and chicks, since I can't give them their own private grow-out pen right now? They will have to share the coop/run and outdoors with the pullets. I assume the broody will roost on the ground with the chicks at night, but I never had a broody before so this is all new to me. I was thinking of removing the current nest box after chicks are hatched, and replacing it with a shallower open box with fresh, more chick-appropriate bedding. I can't put that in the cage with the chick food and water because the broody won't be able to go in and out, so it would have to be in another corner of the coop/run. I am open to suggestions.